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                    6.1 顶点索引
            
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                                <html><head></head><body><div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><ul><li><span class="title-icon "></span><a href="#57-&#x56FE;&#x7247;&#x538B;&#x7F29;&#x5DE5;&#x5177;"><b></b>5.7 &#x56FE;&#x7247;&#x538B;&#x7F29;&#x5DE5;&#x5177;</a></li><ul><li><span class="title-icon "></span><a href="#1-&#x4ECE;gpu&#x4E0B;&#x8F7D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;"><b></b>1. &#x4ECE;GPU&#x4E0B;&#x8F7D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;</a></li><li><span class="title-icon "></span><a href="#2-&#x5C06;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;"><b></b>2. &#x5C06;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;</a></li><li><span class="title-icon "></span><a href="#3-&#x6DFB;&#x52A0;&#x6587;&#x4EF6;&#x5934;"><b></b>3. &#x6DFB;&#x52A0;&#x6587;&#x4EF6;&#x5934;</a></li></ul></ul></ul></div><h2 id="57-&#x56FE;&#x7247;&#x538B;&#x7F29;&#x5DE5;&#x5177;"><a name="57-&#x56FE;&#x7247;&#x538B;&#x7F29;&#x5DE5;&#x5177;" class="anchor-navigation-ex-anchor" href="#57-&#x56FE;&#x7247;&#x538B;&#x7F29;&#x5DE5;&#x5177;"><i class="fa fa-link" aria-hidden="true"></i></a>5.7 &#x56FE;&#x7247;&#x538B;&#x7F29;&#x5DE5;&#x5177;</h2>
<pre><code>CLion&#x9879;&#x76EE;&#x6587;&#x4EF6;&#x4F4D;&#x4E8E; samples\texture\export_compressed_texture
</code></pre><p>&#x4E0A;&#x4E00;&#x8282;&#x4E86;&#x89E3;&#x4E86;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x7684;&#x4F18;&#x52BF; &#x4EE5;&#x53CA;&#x9700;&#x8981;&#x8FDB;&#x884C;&#x4F18;&#x5316;&#x7684;&#x70B9;&#xFF0C;&#x8FD9;&#x4E00;&#x8282;&#x5C31;&#x6765;&#x5B9E;&#x73B0;&#x4F18;&#x5316;&#x6240;&#x9700;&#x7684;&#x56FE;&#x7247;&#x538B;&#x7F29;&#x5DE5;&#x5177;&#x3002;</p>
<p>GPU&#x5C06;&#x4E0A;&#x4F20;&#x7684;RGB&#x6570;&#x636E;&#x8FDB;&#x884C;&#x538B;&#x7F29;&#x4FDD;&#x5B58;&#x4E4B;&#x540E;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x501F;&#x52A9;OpenGL&#x63D0;&#x4F9B;&#x7684;&#x63A5;&#x53E3;<code>glGetCompressedTexImage</code>&#xFF0C;&#x5C06;GPU&#x4E2D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;&#xFF0C;&#x4ECE;&#x663E;&#x5B58;&#x4E0B;&#x8F7D;&#x5230;&#x5185;&#x5B58;&#xFF0C;&#x4E0B;&#x9762;&#x5C31;&#x6765;&#x5B9E;&#x8DF5;&#x3002;</p>
<h3 id="1-&#x4ECE;gpu&#x4E0B;&#x8F7D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;"><a name="1-&#x4ECE;gpu&#x4E0B;&#x8F7D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;" class="anchor-navigation-ex-anchor" href="#1-&#x4ECE;gpu&#x4E0B;&#x8F7D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;"><i class="fa fa-link" aria-hidden="true"></i></a>1. &#x4ECE;GPU&#x4E0B;&#x8F7D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;</h3>
<p>&#x5728;<code>texture2d.cpp</code>&#x6DFB;&#x52A0;&#x51FD;&#x6570; <code>CompressImageFile</code> &#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-keyword">void</span> Texture2D::CompressImageFile(<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; image_file_path,<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; save_image_file_path) {

    Texture2D* texture2d=LoadFromFile(image_file_path);

    <span class="hljs-comment">//1. &#x83B7;&#x53D6;&#x538B;&#x7F29;&#x662F;&#x5426;&#x6210;&#x529F;</span>
    GLint compress_success=<span class="hljs-number">0</span>;
    glGetTexLevelParameteriv(GL_TEXTURE_2D, <span class="hljs-number">0</span>, GL_TEXTURE_COMPRESSED, &amp;compress_success);

    <span class="hljs-comment">//2. &#x83B7;&#x53D6;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x5C3A;&#x5BF8;</span>
    GLint compress_size=<span class="hljs-number">0</span>;
    glGetTexLevelParameteriv(GL_TEXTURE_2D, <span class="hljs-number">0</span>, GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &amp;compress_size);

    <span class="hljs-comment">//3. &#x83B7;&#x53D6;&#x5177;&#x4F53;&#x7684;&#x7EB9;&#x7406;&#x538B;&#x7F29;&#x683C;&#x5F0F;</span>
    GLint compress_format=<span class="hljs-number">0</span>;
    glGetTexLevelParameteriv(GL_TEXTURE_2D, <span class="hljs-number">0</span>, GL_TEXTURE_INTERNAL_FORMAT, &amp;compress_format);

    <span class="hljs-comment">//4. &#x4ECE;GPU&#x4E2D;&#xFF0C;&#x5C06;&#x663E;&#x5B58;&#x4E2D;&#x4FDD;&#x5B58;&#x7684;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;&#xFF0C;&#x4E0B;&#x8F7D;&#x5230;&#x5185;&#x5B58;</span>
    <span class="hljs-keyword">void</span>* img=<span class="hljs-built_in">malloc</span>(compress_size);
    glGetCompressedTexImage(GL_TEXTURE_2D,<span class="hljs-number">0</span>,img);
}
</code></pre>
<p>&#x76F8;&#x5173;&#x63A5;&#x53E3;&#x5B9A;&#x4E49;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-c++"><span class="hljs-comment">/** 
 * @brief &#x83B7;&#x53D6;&#x6307;&#x5B9A;mipmap&#x5C42;&#x7EA7;&#x7EB9;&#x7406;&#x7684;&#x76F8;&#x5173;&#x4FE1;&#x606F;;
 * @param target &#x76EE;&#x6807;&#x7EB9;&#x7406;&#xFF0C;GL_TEXTURE_2D(2D&#x7EB9;&#x7406;)
 * @param level &#x5F53;&#x56FE;&#x7247;&#x6570;&#x636E;&#x662F;&#x5305;&#x542B;&#x591A;&#x4E2A;mipmap&#x5C42;&#x7EA7;&#x65F6;&#xFF0C;&#x6307;&#x5B9A;&#x4F7F;&#x7528;mipmap&#x5C42;&#x7EA7;&#x3002;
 * @param pname &#x60F3;&#x83B7;&#x5F97;&#x4EC0;&#x4E48;&#x4FE1;&#x606F;&#xFF1F;GL_TEXTURE_COMPRESSED(&#x7EB9;&#x7406;&#x538B;&#x7F29;&#x662F;&#x5426;&#x6210;&#x529F;) GL_TEXTURE_COMPRESSED_IMAGE_SIZE(&#x7EB9;&#x7406;&#x538B;&#x7F29;&#x540E;&#x7684;&#x5927;&#x5C0F;) GL_TEXTURE_INTERNAL_FORMAT(&#x7EB9;&#x7406;&#x538B;&#x7F29;&#x540E;&#x7684;&#x683C;&#x5F0F;)
 * @param params &#x7528;&#x6765;&#x63A5;&#x6536;&#x67E5;&#x8BE2;&#x7ED3;&#x679C;&#x7684;&#x6307;&#x9488;
 * @return
 */</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">glGetTexLevelParameteriv</span><span class="hljs-params">(GLenum   target, GLint   level, GLenum   pname, GLint  * params)</span></span>;

<span class="hljs-comment">/** 
 * @brief &#x4E0B;&#x8F7D;&#x6307;&#x5B9A;mipmap&#x5C42;&#x7EA7;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;;
 * @param target &#x76EE;&#x6807;&#x7EB9;&#x7406;&#xFF0C;GL_TEXTURE_2D(2D&#x7EB9;&#x7406;)
 * @param level &#x5F53;&#x56FE;&#x7247;&#x6570;&#x636E;&#x662F;&#x5305;&#x542B;&#x591A;&#x4E2A;mipmap&#x5C42;&#x7EA7;&#x65F6;&#xFF0C;&#x6307;&#x5B9A;&#x4F7F;&#x7528;mipmap&#x5C42;&#x7EA7;&#x3002;
 * @param img &#x7528;&#x6765;&#x4FDD;&#x5B58;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x7684;&#x5185;&#x5B58;&#x5757;&#x6307;&#x9488;
 * @return
 */</span>
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">glGetCompressedTexImage</span><span class="hljs-params">(GLenum   target, GLint   level, <span class="hljs-keyword">void</span> * img)</span></span>;
</code></pre>
<p>&#x7136;&#x540E;&#x5728;<code>main</code>&#x51FD;&#x6570;&#x4E2D;&#x8FDB;&#x884C;&#x8C03;&#x7528;&#x3002;</p>
<pre><code class="lang-c++"><span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">main</span><span class="hljs-params">(<span class="hljs-keyword">void</span>)</span>
</span>{
    init_opengl();

    <span class="hljs-comment">//&#x4ECE;GPU&#x4E2D;&#xFF0C;&#x5C06;&#x663E;&#x5B58;&#x4E2D;&#x4FDD;&#x5B58;&#x7684;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;&#xFF0C;&#x4E0B;&#x8F7D;&#x5230;&#x5185;&#x5B58;&#xFF0C;&#x5E76;&#x4FDD;&#x5B58;&#x5230;&#x786C;&#x76D8;&#x3002;</span>
    <span class="hljs-built_in">std</span>::<span class="hljs-function"><span class="hljs-built_in">string</span> <span class="hljs-title">src_image_file_path</span><span class="hljs-params">(<span class="hljs-string">&quot;../data/images/urban.jpg&quot;</span>)</span></span>;
    <span class="hljs-built_in">std</span>::<span class="hljs-function"><span class="hljs-built_in">string</span> <span class="hljs-title">cpt_file_path</span><span class="hljs-params">(<span class="hljs-string">&quot;../data/images/urban.cpt&quot;</span>)</span></span>;
    Texture2D::CompressImageFile(src_image_file_path,cpt_file_path);

    ......
}
</code></pre>
<p>&#x8FD0;&#x884C;&#x9879;&#x76EE;&#x6D4B;&#x8BD5;&#xFF0C;&#x65AD;&#x70B9;&#x67E5;&#x770B;&#xFF0C;&#x6570;&#x636E;&#x5DF2;&#x7ECF;&#x4ECE;GPU&#x4E0B;&#x8F7D;&#x5230;&#x5185;&#x5B58;&#x4E2D;&#xFF0C;&#x6570;&#x636E;&#x5927;&#x5C0F;&#x4E3A;8388608&#x5B57;&#x8282;&#x3002;
<a href="../../imgs/texture_make_beautiful/export_compressed_texture/download_compressed_to_memory.jpg" data-lightbox="16e896fc-2f60-4e0d-8953-2c9bf9ff589f" data-title=""><img src="../../imgs/texture_make_beautiful/export_compressed_texture/download_compressed_to_memory.jpg" alt=""></a></p>
<h3 id="2-&#x5C06;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;"><a name="2-&#x5C06;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;" class="anchor-navigation-ex-anchor" href="#2-&#x5C06;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;"><i class="fa fa-link" aria-hidden="true"></i></a>2. &#x5C06;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;</h3>
<p>&#x4E0A;&#x9762;&#x53EA;&#x662F;&#x5C06;GPU&#x4E2D;&#x538B;&#x7F29;&#x597D;&#x7684;&#x7EB9;&#x7406;&#x6570;&#x636E;&#xFF0C;&#x4ECE;&#x663E;&#x5B58;&#x4E0B;&#x8F7D;&#x5230;&#x5185;&#x5B58;&#xFF0C;&#x73B0;&#x5728;&#x6765;&#x8FDB;&#x884C;&#x6700;&#x540E;&#x4E00;&#x6B65;&#xFF0C;&#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;&#x3002;
&#x5728;&#x51FD;&#x6570; <code>CompressImageFile</code> &#x6DFB;&#x52A0;&#x4FDD;&#x5B58;&#x6587;&#x4EF6;&#x7684;&#x4EE3;&#x7801;&#x3002;</p>
<pre><code class="lang-c++"><span class="hljs-keyword">void</span> Texture2D::CompressImageFile(<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; image_file_path,<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; save_image_file_path) {
    ....

    <span class="hljs-comment">//4. &#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;</span>
    <span class="hljs-function">ofstream <span class="hljs-title">output_file_stream</span><span class="hljs-params">(save_image_file_path,ios::out | ios::binary)</span></span>;
    output_file_stream.write((<span class="hljs-keyword">char</span>*)img,compress_size);
    output_file_stream.close();
}
</code></pre>
<p>&#x8FD0;&#x884C;&#x9879;&#x76EE;&#xFF0C;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x88AB;&#x4FDD;&#x5B58;&#x5230;&#x6587;&#x4EF6; <code>urban.cpt</code> &#x4E2D;&#x3002;
<a href="../../imgs/texture_make_beautiful/export_compressed_texture/save_file_success.jpg" data-lightbox="1faad5af-a110-4fb6-8f65-8d189aeed305" data-title=""><img src="../../imgs/texture_make_beautiful/export_compressed_texture/save_file_success.jpg" alt=""></a></p>
<pre><code>cpt &#x662F;&#x6211;&#x53D6;&#x81EA;`compressed texture`&#x7684;&#x7F29;&#x5199;&#x3002;
</code></pre><h3 id="3-&#x6DFB;&#x52A0;&#x6587;&#x4EF6;&#x5934;"><a name="3-&#x6DFB;&#x52A0;&#x6587;&#x4EF6;&#x5934;" class="anchor-navigation-ex-anchor" href="#3-&#x6DFB;&#x52A0;&#x6587;&#x4EF6;&#x5934;"><i class="fa fa-link" aria-hidden="true"></i></a>3. &#x6DFB;&#x52A0;&#x6587;&#x4EF6;&#x5934;</h3>
<p>&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x6570;&#x636E;&#x5DF2;&#x7ECF;&#x4ECE;GPU&#x4E0B;&#x8F7D;&#x5230;&#x5185;&#x5B58;&#xFF0C;&#x5E76;&#x4FDD;&#x5B58;&#x4E3A;<code>.cpt</code>&#x6587;&#x4EF6;&#xFF0C;&#x4F46;&#x662F;&#x6587;&#x4EF6;&#x4ECD;&#x7136;&#x4E0D;&#x662F;&#x5B8C;&#x5168;&#x4F53;&#xFF0C;&#x8FD8;&#x9700;&#x8981;&#x8FDB;&#x5316;&#x3002;</p>
<p>&#x5728;&#x8C03;&#x7528;OpenGL&#x63D0;&#x4F9B;&#x7684;&#x63A5;&#x53E3;&#xFF0C;&#x4E0A;&#x4F20;&#x56FE;&#x7247;&#x6570;&#x636E;&#x5230;GPU&#x65F6;&#xFF0C;&#x9664;&#x4E86;&#x9700;&#x8981;&#x4F20;&#x5165;&#x56FE;&#x7247;&#x6570;&#x636E;&#xFF0C;&#x8FD8;&#x9700;&#x8981;&#x4F20;&#x5165;&#x56FE;&#x7247;mipmap&#x5C42;&#x7EA7;&#x3001;&#x5BBD;&#x3001;&#x9AD8;&#x3001;&#x538B;&#x7F29;&#x7EB9;&#x7406;&#x683C;&#x5F0F;&#x7B49;&#x4FE1;&#x606F;&#xFF0C;&#x73B0;&#x5728;<code>.cpt</code> &#x6587;&#x4EF6;&#x91CC;&#x9762;&#x53EA;&#x6709;&#x56FE;&#x7247;&#x6570;&#x636E;&#xFF0C;&#x6240;&#x4EE5;&#x8FD8;&#x9700;&#x8981;&#x5C06;&#x5176;&#x4ED6;&#x7684;&#x53C2;&#x6570;&#x5199;&#x5165;&#x5230;<code>.cpt</code> &#x6587;&#x4EF6;&#x3002;</p>
<p>&#x56E0;&#x4E3A;&#x8FD9;&#x4E9B;&#x6570;&#x636E;&#x8981;&#x5728;&#x8BFB;&#x53D6;<code>.cpt</code>&#x6587;&#x4EF6;&#x6700;&#x5F00;&#x59CB;&#x7684;&#x65F6;&#x5019;&#x8BFB;&#x53D6;&#xFF0C;&#x6240;&#x4EE5;&#x5C06;&#x5176;&#x4F5C;&#x4E3A;&#x6587;&#x4EF6;&#x5934;&#x5199;&#x5165;&#x3002;</p>
<p>&#x53EF;&#x4EE5;&#x7528;&#x4E00;&#x4E2A;&#x6587;&#x4EF6;&#x5934;&#x7ED3;&#x6784;&#x4F53;&#x6765;&#x7EC4;&#x7EC7;&#x8FD9;&#x4E9B;&#x4FE1;&#x606F;&#xFF0C;&#x5728; <code>texture2d.h</code> &#x5B9A;&#x4E49;&#x7ED3;&#x6784;&#x4F53;<code>TpcFileHead</code>:</p>
<pre><code class="lang-c++"><span class="hljs-comment">//tcp&#x6587;&#x4EF6;&#x5934;</span>
<span class="hljs-keyword">struct</span> TpcFileHead
{
    <span class="hljs-keyword">char</span> type_[<span class="hljs-number">3</span>];
    <span class="hljs-keyword">int</span> mipmap_level_;
    <span class="hljs-keyword">int</span> width_;
    <span class="hljs-keyword">int</span> height_;
    <span class="hljs-keyword">int</span> gl_texture_format_;
    <span class="hljs-keyword">int</span> compress_size_;
};
</code></pre>
<p>&#x5728;&#x51FD;&#x6570; <code>CompressImageFile</code> &#x6DFB;&#x52A0;&#x5199;&#x5165;&#x6587;&#x4EF6;&#x5934;&#x7684;&#x4EE3;&#x7801;&#x3002;</p>
<pre><code class="lang-c++"><span class="hljs-keyword">void</span> Texture2D::CompressImageFile(<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; image_file_path,<span class="hljs-built_in">std</span>::<span class="hljs-built_in">string</span>&amp; save_image_file_path) {
    ....

    <span class="hljs-comment">//5. &#x4FDD;&#x5B58;&#x4E3A;&#x6587;&#x4EF6;</span>
    <span class="hljs-function">ofstream <span class="hljs-title">output_file_stream</span><span class="hljs-params">(save_image_file_path,ios::out | ios::binary)</span></span>;

    TpcFileHead tcp_file_head;
    tcp_file_head.type_[<span class="hljs-number">0</span>]=<span class="hljs-string">&apos;c&apos;</span>;
    tcp_file_head.type_[<span class="hljs-number">1</span>]=<span class="hljs-string">&apos;p&apos;</span>;
    tcp_file_head.type_[<span class="hljs-number">2</span>]=<span class="hljs-string">&apos;t&apos;</span>;
    tcp_file_head.mipmap_level_=texture2d-&gt;mipmap_level_;
    tcp_file_head.width_=texture2d-&gt;width_;
    tcp_file_head.height_=texture2d-&gt;height_;
    tcp_file_head.gl_texture_format_=compress_format;
    tcp_file_head.compress_size_=compress_size;

    output_file_stream.write((<span class="hljs-keyword">char</span>*)&amp;tcp_file_head,<span class="hljs-keyword">sizeof</span>(TpcFileHead));
    output_file_stream.write((<span class="hljs-keyword">char</span>*)img,compress_size);
    output_file_stream.close();
}
</code></pre>
<p>&#x518D;&#x6B21;&#x8FD0;&#x884C;&#x9879;&#x76EE;&#x6D4B;&#x8BD5;&#xFF0C;&#x5E76;&#x7528;&#x5341;&#x516D;&#x8FDB;&#x5236;&#x7F16;&#x8F91;&#x5668;&#x6253;&#x5F00;<code>urban.cpt</code>&#x6587;&#x4EF6;&#xFF0C;&#x67E5;&#x770B;&#x6587;&#x4EF6;&#x5934;&#x662F;&#x5426;&#x6B63;&#x5E38;&#x5199;&#x5165;&#x3002;
<a href="../../imgs/texture_make_beautiful/export_compressed_texture/cpt_head.jpg" data-lightbox="c83fdd44-ce98-4ea0-86a6-3455a884adba" data-title=""><img src="../../imgs/texture_make_beautiful/export_compressed_texture/cpt_head.jpg" alt=""></a></p>
<p>&#x4E0B;&#x4E00;&#x6B65;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x52A0;&#x8F7D;<code>urban.cpt</code>&#x6587;&#x4EF6;&#x8FDB;&#x884C;&#x6E32;&#x67D3;&#x3002; </p>
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